It would be really foolish to make any political settlement based on a promise or expectation of energy supplied by Putin.
Nowhere else to get it.
Russia drains $500-600 Billion from its enemies exporting oil and gas each year. They are just asking Ukraine to add to that.
If they can’t pay, then yes, there will be non monetary costs like having policy dictated, but if they just pay their bills there won’t be any problems.
This is a world where the spigot is more powerful than weaponry. They have the gold and they make the rules.